diff --git a/tox.ini b/tox.ini
index 4591a45..921fee1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -26,8 +26,9 @@
 
 [flake8]
 # E123, E125 skipped as they are invalid PEP-8.
+# W504 line break after binary operator
 
 show-source = True
-ignore = E123,E125
+ignore = E123,E125,W504
 builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build